// The NSpring Framework for .NET
// Copyright (c) 2003, Jeffrey Varszegi
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, 
// are permitted provided that the following conditions are met:
// 
// - Redistributions of source code must retain the above copyright notice, this 
// list of conditions and the following disclaimer.
// 
// - Redistributions in binary form must reproduce the above copyright notice, this 
// list of conditions and the following disclaimer in the documentation and/or other 
// materials provided with the distribution.
// 
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// be used to endorse or promote products derived from this software without 
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namespace NSpring.Logging.Common.Pattern.Patterns {
    
using System;
using System.Text;

/// <summary>
/// A pattern for formatting events; it handles all token types except 
/// EventToken.
/// All underlying pattern-related code is subject to change without warning
/// or deprecation, and should not be called directly by application code
/// </summary>
internal class FullPattern : Pattern {
    private const int DEFAULT_BUFFER_SIZE               = 64;
    private const int SAMPLE_FREQUENCY                  = 5;
    private const int BUFFER_SIZE_RESET_FREQUENCY       = 1500;

    private DataFormatter dataFormatter;
    private int bufferSize                              = DEFAULT_BUFFER_SIZE;
    private int sampleCount                             = 0;

    public FullPattern(string _source, DataFormatter _dataFormatter) : base(_source, true, true, false, true, true) {
        if (_dataFormatter == null) {
            throw new ArgumentNullException();
        }
        dataFormatter = _dataFormatter;
    }

    public DataFormatter DataFormatter {
        set {
            if (value == null) {
                throw new ArgumentNullException();
            }
            dataFormatter = value;
        }
    }
    
    public override string Format(Event e) {
        StringBuilder sb = new StringBuilder(bufferSize);
        Token token;
        for(int x = 0; x < tokens.Length; x++) {
            token = tokens[x];
            switch (token.Type) {
                case TokenType.Text             :
                case TokenType.Separator        : {
                    sb.Append(token.Text);
                    break;
                }
                case TokenType.ContextProperty  : 
                case TokenType.EventProperty    : {
                    sb.Append(token.Format(e));
                    break;
                }
                case TokenType.Data             : {
                    sb.Append(dataFormatter.Format(e.Data));
                    break;
                }
                default                         : {
                    sb.Append(token.Format(e));
                    break;
                }
            }
        }
        
        sampleCount++;
        if ((sampleCount % SAMPLE_FREQUENCY) == 0) {
            int length = sb.Length;
            if (length > bufferSize) {
                bufferSize = length;
            }
            if (sampleCount >= BUFFER_SIZE_RESET_FREQUENCY) {
                bufferSize = DEFAULT_BUFFER_SIZE;
                sampleCount = 0;
            }
        }
        
        return sb.ToString();
    }

    public override void Format(Event e, System.Text.StringBuilder sb) {
        Token token;
        for(int x = 0; x < tokens.Length; x++) {
            token = tokens[x];
            switch (token.Type) {
                case TokenType.Text             :
                case TokenType.Separator        : {
                    sb.Append(token.Text);
                    break;
                }
                case TokenType.ContextProperty  :
                case TokenType.EventProperty    : {
                    sb.Append(token.Format(e));
                    break;
                }
                case TokenType.Data             : {
                    sb.Append(dataFormatter.Format(e.Data));
                    break;
                }
                default                         : {
                    sb.Append(token.Format(e));
                    break;
                }
            }
        }
    }


}

}
